BMW E90 E92 320d N47 177HP ECU KIT DDE CAS3 + Key 7811700 Manual

BMW E90 E92 320d N47 177HP ECU KIT DDE CAS3 + Key 7811700 Manual is a complete control kit designed for the N47 177HP engine in the 3 Series E90/E92, including the DDE module, CAS3 module, and a matched key. Thanks to factory configuration for a manual gearbox, the kit ensures seamless operation of the vehicle's drivetrain and electronics. This solution is dedicated to users seeking a proven, used set of control units for professional repair or replacement.

Specifications and technical data

• SKU: 7811700-7
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7811700
• Substitutable numbers: 13618506199028101504361359147216, 85061999147216, 136178071421361780840113617807200, 1361780900013617812000, 1361781170013617810000, 1361780782713617807530, 1361781250013618508711, 13617806699, 780714278084017807200, 7809000, 61359147212, 13618506199, 8506199, 13617812500, 7812500, 13617812000, 7812000, 13617811700, 7811700, 13617810000, 7810000, 13617809000, 13617808401, 7808401, 13617807827, 7807827, 13617807530, 7807530, 13617807200, 7807200, 13617807142, 7807142, 7806699
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and Function of the ECU DDE CAS3 + Key Kit

The presented kit belongs to the Electronic Control Modules and Units category and is configured to work with the N47 diesel engine in BMW 3 Series E90/E92 320d models with 177 HP. The set includes the DDE engine control unit, the CAS3 module responsible for start authorization, and a matched key, which ensures consistency of the immobilizer system and vehicle electronics.

This combination of components in a single kit minimizes the risk of coding and synchronization issues, which is particularly important when replacing control units in modern BMW constructions.

Compatibility with Manual Gearbox

The kit is prepared for operation with a manual gearbox, which is crucial for proper communication between the engine control unit, the CAS3 module, and other vehicle systems. Correctly matching the control unit version to the gearbox type affects:

• correct torque management and engine operating strategies,
• stable cooperation with safety and comfort systems,
• reduced need for additional programming related to the gearbox type.

For workshops and individual users, this means a more predictable installation process and a lower risk of software incompatibility.

Advantages of Using an Original BMW Kit

Using a complete control kit from BMW allows for the preservation of the original operating logic of the electronic systems. In practice, this translates to:

• consistency between the DDE engine control unit, the CAS3 module, and the key,
• preservation of the vehicle's original security features,
• easier diagnostics using standard BMW service tools.

A used kit of this type is often chosen as an economical alternative to purchasing new control units, while maintaining the operating characteristics typical for the 177 HP N47 engine. This solution is particularly attractive for repairs after electronic damage, immobilizer problems, or when the entire control system needs replacement.

Practical Application in Service

The complete ECU DDE CAS3 + Key kit is suitable for both professional BMW-specialized services and independent workshops. The kit allows for:

• restoring vehicle functionality after an engine control unit or CAS3 module failure,
• reducing the time required for adaptation and programming,
• maintaining compatibility with the original electronic architecture of the E90/E92 320d model.

This makes it a practical solution for repairs where the correct cooperation of all elements of the starting and engine control system is crucial.

Expanding Knowledge and Selecting Proper Components

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same category, such as additional control units, comfort modules, or engine management systems, check the available parts in the BMW Electronic Control Modules and Units category.

When working with the N47 unit in the 3 Series, it is also worth familiarizing yourself with common problems and critical areas of the construction. Practical tips on operation and potential faults can be found in the article: BMW E90 Engine Failures: Find Out What Can Ruin Your Budget!.

For a comparison of how other premium manufacturers approach original electronic components and maintaining brand DNA, you can read the blog post Audi and Pure Emotion. How Used Parts Help Maintain Brand DNA?, which illustrates the importance of proper selection of modules and equipment elements.